fix(audit): P0-P3 audit fixes — 838 ruff errors → 0, 30 F821 bugs fixed, 118 files changed

- P0: hooks.py 3-tuple fix, trigger_dispatcher Contract, contacts/plugin unregister_actions_by_owner
- P0: 5 test files — check_permission mocks removed, hardcoded DB credential → env var
- P1: attachment_service DmsFile via Contract helper, restore_registry/history_hooks dedup
- P1: mail/plugin restore unregister, mcp_client datetime.now(UTC), saved_views/filters patterns
- P1: ProtectedRoute fail-closed, 13 test assertion fixes (bcrypt, DB-URLs, SECRET_KEYs)
- P2: deprecated notifications → post_system_message (3 files), forgejo Base, report_generator lazy import
- P2: webhooks permissions, deps.py/roles.py plugin perms removed, import_export default
- P2: address/tags/entity_links patterns removed, worker.py Contract-Umgehungen fixed
- P2: 28 frontend TODOs (hardcoded constants, deprecated notification API)
- P3: dead code, duplicates, deprecated imports, private attr, __import__ inline
- P3: 8 frontend TODOs (LucideIcons, inline styles, XSS, i18n)
- ruff: 838 → 0 (612 auto-fix + 246 manual + 27 F821 regression fix)
- F821: 30 → 0 (AutomationDefinition, DmsFile, user_id, Path, Any, String)
- Contract-Umgehungen: 2 neue gefunden (worker.py:169, worker.py:280) und gefixt

app/services/contact_service.py

@@ -3,15 +3,15 @@
 from __future__ import annotations
 
 import uuid
-from typing import Any
+from datetime import UTC
 
-from sqlalchemy import select, func, or_, text
+from sqlalchemy import func, select
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm import selectinload
 
+from app.core.hooks import apply_filters, do_action
 from app.models.contact import Contact, ContactPerson
 from app.services.entity_history_service import record_history
-from app.core.hooks import do_action, apply_filters
 
 
 def _compute_displayname(data: dict) -> str:
@@ -243,7 +243,7 @@ async def get_contact(db: AsyncSession, tenant_id: uuid.UUID, contact_id: str,
     contact = result.scalar_one_or_none()
     if not contact:
         raise ValueError("Contact not found")
-    
+
     # Check row-level access
     if user_id and not is_system_admin:
         from app.core.visibility import check_single_entity_access
@@ -252,7 +252,7 @@ async def get_contact(db: AsyncSession, tenant_id: uuid.UUID, contact_id: str,
         )
         if not has_access:
             raise PermissionError("No access to this contact")
-    
+
     return _serialize_contact_detail(contact)
 
 
@@ -454,8 +454,8 @@ async def delete_contact(
     contact_full = result2.scalar_one()
     snapshot_before = _serialize_contact_detail(contact_full)
 
-    from datetime import datetime, timezone
-    contact.deleted_at = datetime.now(timezone.utc)
+    from datetime import datetime
+    contact.deleted_at = datetime.now(UTC)
     await db.flush()
 
     # Record history
@@ -556,7 +556,7 @@ async def delete_contact_person(
     cp = result.scalar_one_or_none()
     if not cp:
         raise ValueError("Contact person not found")
-    from datetime import datetime, timezone
-    cp.deleted_at = datetime.now(timezone.utc)
+    from datetime import datetime
+    cp.deleted_at = datetime.now(UTC)
     await db.flush()